ZSI compatibility P frame downstream of a H Frame

[Avila.Andres]

Hi! Currently on the jobsite we have a Powerpact P Frame breaker with a micrologic 5.0 P as a downstream device for a Powerpact L Frame breaker with a micrologic 5.3 E.

Since the ZSI module LV434212 is required for each Masterpact NT/NW, PowerPact P/R, or Compact NS circuit breaker that is connected upstream of Powerpact H/J/L or Compact NSX circuit breaker,

Is the opposite also true? If I have an H frame connected upstream of a Powerpact P/R, do I also need a ZSI Module?

  

Thank you,

[S-W]

Hi @Avila.Andres, Could you upload the images again? It's not showing up anymore. Just wanna make sure we understand your case correctly. Thank you.

[Avila.Andres]

I sure can, thank you for taking the time.

The Downstream device is a P Frame breaker with a micrologic 5.0 P while the Upstream breaker is an H Frame with a micrologic 5.3 E.

[Avila.Andres]

Following this table it seems there is no compatibility from a Downstream P frame to an Upstream L frame?

[Gregoire_Brun · Accepted solution]

How is it possible to have a Powerpact L 400A upstream and a Powerpact P 800A downstream ?

For thermal / câble protection , it look not correct and maybe dangerous !

Our recomendation is to have a smaller or equivalent device dowstream of all breakers. With natural selectivity function on the breaker, it's the powerpact L witch will trip all the time am first. the P breaker will not protect anythink.

So why you choice a powerpact P for downstream network?

Correct me if I'm wrong....

Gregoire